A nine-sided object is known as a nonagon.
A triangular prism is a 3-d object. It does not have a 2-d name because it is not a 2-d object!
Octagon.
A quadrilateral
Heptagon .
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Sometimes it is - a noun is a name of an object (or type of object), or of an idea.
Granado
"KCHS" stands for "Knight Commander of the Holy Sepulchre," an honor bestowed upon members of the Catholic Church who have made significant contributions in their service to the church.
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Telemachus
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Mara